Cool breeze,
That would be the Arapeen trail system north east if The Paiute. Every bit as scenic, lot less crowded. We stayed at Joe's Valley. They have a jamboree as well.
You can ride to your heart's content. East thru Ferron and out to the Swell, South thru Gooseberry ..also very scenic. It's all connected. Also some nice museums in the Price area.
I have a lot of photos, especially of my RZR days up in there. Tough to post. I will tell you there are many concrete and or steel posts limiting travel to 55". Our RZR is the first model, and because of The posts we never upgraded.
Fwiw we found your Trinity Alps fantastic! Rode that area out from Trinity Center. Also the only place I felt a little uneasy about. (Strange characters doing strange things like armed, towing tree branches over paths to cover tracks, mining or "growing" in isolated areas) Alder Point was another interesting spot. (Later found out it was called Murder Hill :D)